JP2003042163A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of favorably supplying a lubricant into a bearing without deteriorating the strength of a retainer. SOLUTION: A pair of notched grooves 30, 30 communicating with only the both axial end faces of the retainer 14 respectively are dented at the outer peripheral face of each column 18 oppositely facing the track face of the outer ring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing which holds a plurality of rolling elements arranged between inner and outer rings along a circumferential direction so as to be freely rollable between pillar portions of a cage, and more particularly to an oil bath. The present invention relates to the improvement of rolling bearings used in lubrication environments such as the oil spray method and the spray oiling method.

[0002]

2. Description of the Related Art Conventionally, as a cage for rolling bearings used under impact load or environment with large vibration, a machined cage for outer ring guide having excellent impact resistance is used to prevent the cage from breaking. Often. When a rolling bearing using such an outer ring guide cage is used in the oil bath method, the splash oiling method, etc., lubricating oil is applied between the guide surface (outer peripheral surface) of the cage and the inner peripheral surface of the outer ring from the outside of the bearing. It is designed to flow into the outer ring raceway through the gap.

However, since the outer ring guide cage has a small gap between the outer peripheral surface of the cage and the inner peripheral surface of the outer ring, it is difficult for the lubricating oil outside the bearing to flow into the raceway surface inside the bearing.
Since the lubricating oil that has flowed into the bearing is less likely to flow out of the bearing and the lubricating oil is less likely to circulate, there is a problem that seizure or wear occurs during the initial rotation of the bearing or during rotation. Therefore, in order to solve such a problem, for example, Japanese Patent Laid-Open No. 11-20
Tapered roller bearings disclosed in Japanese Patent No.
A spherical roller bearing and the like disclosed in Japanese Patent Laid-Open No. 1-285255 have been proposed.

As shown in FIG. 9, the tapered roller bearing disclosed in JP-A-11-201149 has a plurality of tapered rollers 1a arranged between the inner and outer rings along the circumferential direction.
The pocket 2 of the cage 1 is rotatably held, and cutout holes 3 are formed at both side edges of the pocket 2 in the circumferential direction and both side edges in the axial direction. It was done.

On the other hand, the self-aligning roller bearing disclosed in the above-mentioned Japanese Patent Laid-Open No. 11-182552 is shown in FIGS.
As shown in FIG. 5, the cage 7 rotatably holds a plurality of barrel-shaped rollers 6 arranged in two rows between the inner and outer rings 4 and 5 along the circumferential direction. A notch groove 8 is formed on the outer peripheral surface of the bearing so as to communicate from the outside of the bearing to the raceway inside the bearing.

That is, the cage is provided with the notch hole 3 and the notch groove 8 communicating from the outside of the bearing to the raceway inside the bearing in this way, and the dynamic pressure effect at the time of rotation of the bearing is utilized to lubricate the bearing. The bearing is configured so that it can be replenished satisfactorily to prevent seizure, abrasion, etc. from occurring during or during the initial rotation of the bearing.

[0007]

However, in the tapered roller bearing described in Japanese Patent Laid-Open No. 11-201149, cutout holes are formed in both side edges of the pocket 2 of the cage 1 in the circumferential direction and both side edges in the axial direction. Since the cage 3 is formed, the cross-sectional shapes of the pillar portion 3a of the cage 1 and the pockets 2 on both sides in the axial direction become thin, and the strength of the cage 1 may decrease.

Also, in the self-aligning roller bearing described in JP-A-11-182552, the notch groove 8 formed in the outer peripheral surface of the retainer 7 is connected to the pocket 9 so that the retainer is retained. Although not as strong as the container 1, the strength of the holder 7 may decrease.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and to provide a rolling bearing which can satisfactorily supply lubricating oil into the bearing without lowering the strength of the cage. .

[0010]

The above object of the present invention is to provide a rolling bearing having an inner ring, an outer ring, a plurality of rolling elements, and a retainer for holding these rolling elements, wherein the retainer comprises:
A retainer that rotatably holds the plurality of rolling elements arranged between the inner and outer rings along the circumferential direction between the column portions of the retainer, the column portions facing the raceway surface of the outer ring. This is achieved by a rolling bearing characterized in that a notch groove communicating with only both axial end surfaces of the cage is provided on the outer peripheral surface of the rolling bearing.

According to the above structure, the lubricating oil can easily enter the raceway surface inside the bearing and can easily exit the bearing via the notch groove formed in the outer peripheral surface of each column portion of the cage. Therefore, the lubricating oil in the bearing can be easily circulated. Further, the notch groove is recessed in the outer peripheral surface of each pillar portion so as to communicate only with both axial end surfaces of the cage, and does not lead to a pocket formed between each pillar portion. Compared with the conventional cage in which the above-described processing is performed, the cross-sectional shape of the column portion and the pocket of the cage on both sides in the axial direction does not become thin, and the strength of the cage does not decrease. Furthermore, since the notch groove is formed on the outer peripheral surface of the cage, the centrifugal force of the lubricating oil due to the rotation of the bearing can be effectively used.

When the cage is an outer ring guide cage having a small gap between the outer circumferential surface of the cage and the inner circumferential surface of the outer ring, the inflow / outflow of the lubricating oil into / from the bearing by the notch groove. The promotion effect can be made more effective. Further, even when the outer ring is provided with both flanges and the rolling element is composed of a cylindrical roller, the lubricating oil can be effectively replenished to the outer ring raceway of the cylindrical roller bearing in which the lubricating oil does not easily flow.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A rolling bearing according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Figure 1
1 is a sectional view of a main part for explaining a cylindrical roller bearing according to an embodiment of the present invention, FIG. 2 is a partial perspective view of the cage shown in FIG. 1, and FIGS. 3 to 6 are cages shown in FIG. 7 is a partial perspective view for explaining a modification of the notch groove of FIG. 7, FIG. 7 is a cross-sectional view of an essential part for explaining a deep groove ball bearing according to another embodiment of the present invention, and FIG. 8 is a holding view shown in FIG. It is a partial perspective view of a container.

As shown in FIG. 1, in the cylindrical roller bearing (rolling bearing) 10 of this embodiment, a plurality of cylindrical rollers (rolling elements) 13 are interposed between an inner ring 11 and an outer ring 12 via a cage 14. It is arranged to roll freely. A raceway groove 15 is formed on the inner peripheral surface of the outer ring 12, the bottom surface of the raceway groove 15 is an outer ring raceway surface 16, and outer ring collars 17 are arranged on both axial sides of the outer ring raceway surface 16. .

The cylindrical roller bearing 10 has the outer ring 1
2 is supported by the housing 20, and the inner ring 11 is fitted on the shaft 21. Further, the inside of the housing 20 serves as an oil chamber 22, in which lubricating oil 23 is stored, and lubrication is performed by an oil bath method.

The cage 14 is of an outer ring guide type, and the outer peripheral surface thereof is disposed so as to face the inner peripheral surface of the outer ring collar 17, and a cylindrical roller is provided in a pocket 19 (see FIG. 2) between the pillar portions 18. 13 is rotatably held. The pocket 1
Numeral 9 is an opening having a substantially rectangular shape corresponding to the cylindrical roller 13, and notches 19a for communicating the outer ring side space and the inner ring side space are formed at the four corners thereof.

Further, the cage 14 of the present embodiment has axially opposite ends of the cage 14 on the outer peripheral surface (see the hatched portion in FIG. 2) of each column portion 18 facing the raceway surface 16 of the outer ring 12. A pair of notch grooves 30, 30 communicating with only the surface are provided as recesses. That is, the notch groove 30 is arranged at each of both ends in the axial direction of each column portion 18 on the outer peripheral surface of the retainer 14 and is symmetrical with respect to the axis at a predetermined angle in opposite directions. Two grooves 31, 31 arranged
Is formed in a substantially V shape so that the confluent portion of each groove 31 communicates only with the end face of the cage 14.

The width of each groove 31 in the cutout groove 30 is about 0.5 mm to about 1/3 of the width of each column portion 18. If this width is too narrow, the effect of inflow of lubricating oil into the bearing is reduced. If it is too wide, the strength of the cage will be reduced. The depth of each groove 31 is several μm to 1/10 of the cage thickness.
If the depth is too shallow, the effect of lubricating oil flowing into the bearing is reduced, and if it is too wide, the strength of the cage is reduced.

Therefore, according to the cylindrical roller bearing 10 of the present embodiment, the lubricating oil passes through the notch groove 30 formed in the outer peripheral surface of each column portion 18 of the cage 14 and recessed in the outer ring 1.
Since it easily enters the second raceway surface 16 and easily exits the outside of the bearing, the lubricating oil in the bearing 10 can be easily circulated. As a result, it is possible to favorably prevent seizure, wear and the like from occurring at the initial stage of rotation of the cylindrical roller bearing 10 and during the rotation thereof.

Further, the notch groove 30 is formed in the outer peripheral surface of each pillar portion 18 so as to communicate only with both axial end surfaces of the cage 14, and is formed between the pillar portions 18. Since it is not connected to the pocket 19, compared to the conventional cages 1 and 7 (see FIGS. 9 and 11) in which the pocket 19 is processed, the cross-sections of the pillar portion 18 of the cage 14 and both sides of the pocket 19 in the axial direction. The shape does not become thin, and the strength of the cage 14 does not decrease. Further, the notch groove 30 is provided in the cage 1.
Since it is formed on the outer peripheral surface of 4, the centrifugal force of the lubricating oil due to the rotation of the bearing can be effectively utilized. As a result, it was possible to make it suitable for use under impact load or in an environment with large vibration.

Moreover, in the cylindrical roller bearing 10, the outer ring 12 is provided with outer ring collars 17 on both sides in the axial direction, and
Although the cage 14 is an outer ring guide cage having a small gap with the inner peripheral surface of the outer ring 12, the lubricating oil easily enters the raceway surface 16 of the outer ring 12 through the notch groove 30, The lubricating oil could be effectively replenished to the raceway surface 16.

The two grooves 31 of the cutout groove 30 are also provided.
Are symmetrically arranged at a predetermined angle in opposite directions with respect to the axis, the effect of promoting the inflow / outflow of lubricating oil into the bearing by the notch groove 30 can be obtained in both rotation directions of the bearing. it can. In the above embodiment, the case where the notch groove 30 is formed on the outer peripheral surface of the cage 14 of the cylindrical roller bearing 10 is taken as an example, but the present invention is not limited to this, and other types of tapered roller bearings, ball bearings, and the like may be used. The notch groove 30 may be formed on the outer peripheral surface of the cage of the rolling bearing.

Further, in the above embodiment, the notch grooves 30 are formed in each of the column portions 18 of the cage 14, but the number of the notch grooves 30 can be reduced within the range where the lubricity can be ensured. . Further, in the above embodiment, the notch groove 3
0 is formed in a substantially V shape by two grooves 31, 31 which are symmetrically arranged so as to be inclined in opposite directions with respect to the axis at a predetermined angle, and the confluent portion of each groove 31 is arranged on the end face side of the cage 14. Although they are communicated with each other, the invention is not limited to this. For example, FIGS.
Even when the notch groove having the shape as shown in FIG. 3 is formed on the outer peripheral surface of each cage, the same effect as that of the cage 14 of the above-described embodiment can be obtained.

The notched groove 40 shown in FIG. 3 is formed in a substantially V-shape by two grooves 41, 41 symmetrically arranged so as to be inclined at a predetermined angle in mutually opposite directions with respect to the axis line. Three
This is an example in which the end portion on the expansion side of 1 is made to communicate with the end surface of the cage 14. The notch groove 50 shown in FIG. 4 has grooves 51 which are inclined at a predetermined angle with respect to the axis and are arranged on one end side and the other end side of the retainer 14 in the axial direction, respectively, with the inclination directions facing the opposite sides. In this example, one end of each groove 51 is communicated with the end surface of the cage 14.

The notched groove 60 shown in FIG. 5 has a groove 61 extending along the axial direction, which is arranged at one end side and the other end side in the axial direction of the cage 14, respectively, and one end portion of each groove 61 is formed. Cage 1
In this example, the end face of No. 4 is communicated. The notched groove 70 shown in FIG. 6 is an example in which both ends of one groove 71 extending along the axial direction of the cage 14 are communicated with both end surfaces of the cage 14.

Next, referring to FIGS. 7 and 8, a deep groove ball bearing 80 according to another embodiment of the present invention will be described. Figure 7
As shown in FIG. 7, in the deep groove ball bearing (rolling bearing) 80 of the present embodiment, a plurality of balls (rolling elements) 83 are rotatably arranged via a cage 84 between an inner ring 81 and an outer ring 82. Has been done.

In the deep groove ball bearing 80, the outer ring 82 is supported by the housing 20 and the inner ring 81 is fitted on the shaft 21, as in the cylindrical roller bearing 10 of the above embodiment. Further, the inside of the housing 20 serves as an oil chamber 22, in which lubricating oil 23 is stored, and lubrication is performed by an oil bath method.

The retainer 84 is of an outer ring guide type, and its outer peripheral surface is arranged to face the inner peripheral surface of the outer ring 82.
A ball 83 is rollably held in a pocket 89 (see FIG. 8) between the pillars 88. The pocket 89 is a ball 8
Corresponding to 3, the opening has a substantially circular shape.

Further, the cage 84 of the present embodiment has the outer ring 8
A pair of notch grooves 90, 90 are formed on the outer peripheral surface of the column portion 88 (see the hatched portion in FIG. 8) facing the second raceway surface 82a, and communicate with only the both axial end surfaces of the cage 84. Has been done. That is, the notch groove 90 is formed in the retainer 84.
By the two grooves 91, 91, which are arranged at both ends in the axial direction of each pillar portion 88 on the outer peripheral surface of the, and are symmetrically arranged at a predetermined angle in opposite directions with respect to the axis, It is formed in a V shape so that the confluent portion of each groove 91 communicates only with the end surface of the cage 84.

Therefore, according to the deep groove ball bearing 80 of the present embodiment, the lubricating oil is supplied to the outer ring 82 through the notch groove 90 formed in the outer peripheral surface of each column portion 88 of the retainer 84.
Since it easily enters the raceway surface 82a and exits the outside of the bearing, it is possible to easily circulate the lubricating oil in the bearing 80. As a result, the cylindrical roller bearing 1 of the above embodiment
Similar to 0, it is possible to favorably prevent seizure, wear, and the like from occurring at the initial stage of rotation or during the rotation of the deep groove ball bearing 80.

The rolling bearing of the present invention is not limited to the configuration of the cylindrical roller bearing 10 and the deep groove ball bearing 80 in each of the above embodiments, and it goes without saying that it can be applied to various rolling bearings. Further, the configuration of the cutout groove according to the present invention is not limited to the configuration of the cutout groove in each of the above-described embodiments, and it goes without saying that various configurations can be adopted based on the spirit of the present invention.

[0032]

As is apparent from the above description, according to the rolling bearing of the present invention, the lubricating oil is supplied to the inside of the bearing through the notch groove formed in the outer peripheral surface of each column of the cage. Since it easily enters the raceway surface and easily exits the bearing, it is possible to easily circulate the lubricating oil in the bearing.
Therefore, it is possible to favorably prevent seizure, wear, or the like from occurring during or during the rotation of the rolling bearing.

Further, the notch groove is provided in the outer peripheral surface of each pillar portion so as to communicate only with both axial end surfaces of the cage, and does not lead to a pocket formed between the pillar portions. Therefore, compared with the conventional cage in which the pocket is processed, the cross-sectional shape of the column portion of the cage and the both sides in the axial direction of the pocket do not become thin, and the strength of the cage does not decrease. Furthermore, since the notch groove is formed on the outer peripheral surface of the cage, the centrifugal force of the lubricating oil due to the rotation of the bearing can be effectively used. Therefore, it is possible to provide the rolling bearing which can favorably supply the lubricating oil to the inside of the bearing without lowering the strength of the cage.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part for explaining a cylindrical roller bearing according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of the retainer shown in FIG.

FIG. 3 is a partial perspective view for explaining a modified example of the cutout groove of the retainer shown in FIG.

FIG. 4 is a partial perspective view for explaining a modified example of the cutout groove of the retainer shown in FIG.

5 is a partial perspective view for explaining a modified example of the cutout groove of the cage shown in FIG.

FIG. 6 is a partial perspective view for explaining a modified example of the cutout groove of the retainer shown in FIG.

FIG. 7 is a sectional view of relevant parts for explaining a deep groove ball bearing according to another embodiment of the present invention.

8 is a partial perspective view of the retainer shown in FIG. 7. FIG.

FIG. 9 is a plan view in which a part of a conventional cage of a tapered roller bearing is developed.

FIG. 10 is a partially cutaway perspective view for explaining a conventional spherical roller bearing.

11 is an overall perspective view of the cage shown in FIG.

[Explanation of symbols]

10 Cylindrical roller bearings (rolling bearings) 11 inner ring 12 outer ring 13 Cylindrical rollers (rolling elements) 14 cage 16 orbital plane 17 outer ring tsuba 18 Pillars 19 pockets 30 Notch groove

Claims (3)

[Claims] 1. A rolling bearing having an inner ring, an outer ring, a plurality of rolling elements, and a retainer for holding these rolling elements, wherein the retainer is disposed between the inner and outer rings along the circumferential direction. A retainer that holds the plurality of rolling elements rollably between the pillar portions of the cage, wherein the outer peripheral surface of each of the pillar portions that faces the raceway surface of the outer ring,
A rolling bearing characterized in that a notch groove communicating with only both axial end faces of the cage is provided. 2. The rolling bearing according to claim 1, wherein the cage is an outer ring guide cage. 3. The rolling bearing according to claim 1, wherein the outer ring is provided with both flanges, and the rolling elements are cylindrical rollers.